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    <link rel="stylesheet" href="style.css">
    <title>Web/Golang Calculator</title>
</head>

<body>
    <div class="container">
        <div class="up-screen">
            <span>0</span>
        </div>
        <div class="down-screen">
            <span>0</span>
        </div>
        <div class="keyboard">
            <div>
                <button class="operator">sin</button>
                <button class="operator">π</button>
                <button class="operator">e</button>
                <button class="operator">C</button>
                <button class="operator">←</button>
            </div>
            <div>
                <button class="operator">cos</button>
                <button class="operator">(</button>
                <button class="operator">)</button>
                <button class="operator">n!</button>
                <button class="operator">÷</button>
            </div>
            <div>
                <button class="operator">tan</button>
                <button class="number">7</button>
                <button class="number">8</button>
                <button class="number">9</button>
                <button class="operator">×</button>
            </div>
            <div>
                <button class="operator">1/x</button>
                <button class="number">4</button>
                <button class="number">5</button>
                <button class="number">6</button>
                <button class="operator">-</button>
            </div>
            <div>
                <button class="operator">x²</button>
                <button class="number">1</button>
                <button class="number">2</button>
                <button class="number">3</button>
                <button class="operator">+</button>
            </div>
            <div>
                <button class="operator">√x</button>
                <button class="number">+/-</button>
                <button class="number">0</button>
                <button class="number">.</button>
                <button id="equal">=</button>
            </div>
        </div>
    </div>
    <div id="statement">
        <span>By Yuwang Cai</span>
    </div>
    <a href="https://github.com/MrCaiDev" class="github-corner" aria-label="View source on GitHub"><svg width="80"
            height="80" viewBox="0 0 250 250" aria-hidden="true">
            <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
            <path
                d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"
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                d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
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